// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/renderer_host/input/synthetic_smooth_scroll_gesture.h"

namespace content {

SyntheticSmoothScrollGesture::SyntheticSmoothScrollGesture(
    const SyntheticSmoothScrollGestureParams& params)
    : params_(params)
{
}

SyntheticSmoothScrollGesture::~SyntheticSmoothScrollGesture()
{
}

SyntheticGesture::Result SyntheticSmoothScrollGesture::ForwardInputEvents(
    const base::TimeTicks& timestamp,
    SyntheticGestureTarget* target)
{
    if (!move_gesture_) {
        if (!InitializeMoveGesture(params_.gesture_source_type, target))
            return SyntheticGesture::GESTURE_SOURCE_TYPE_NOT_IMPLEMENTED;
    }
    return move_gesture_->ForwardInputEvents(timestamp, target);
}

SyntheticSmoothMoveGestureParams::InputType
SyntheticSmoothScrollGesture::GetInputSourceType(
    SyntheticGestureParams::GestureSourceType gesture_source_type)
{
    if (gesture_source_type == SyntheticGestureParams::MOUSE_INPUT)
        return SyntheticSmoothMoveGestureParams::MOUSE_WHEEL_INPUT;
    else
        return SyntheticSmoothMoveGestureParams::TOUCH_INPUT;
}

bool SyntheticSmoothScrollGesture::InitializeMoveGesture(
    SyntheticGestureParams::GestureSourceType gesture_type,
    SyntheticGestureTarget* target)
{
    if (gesture_type == SyntheticGestureParams::DEFAULT_INPUT)
        gesture_type = target->GetDefaultSyntheticGestureSourceType();

    if (gesture_type == SyntheticGestureParams::TOUCH_INPUT || gesture_type == SyntheticGestureParams::MOUSE_INPUT) {
        SyntheticSmoothMoveGestureParams move_params;
        move_params.start_point = params_.anchor;
        move_params.distances = params_.distances;
        move_params.speed_in_pixels_s = params_.speed_in_pixels_s;
        move_params.prevent_fling = params_.prevent_fling;
        move_params.input_type = GetInputSourceType(gesture_type);
        move_params.add_slop = true;
        move_gesture_.reset(new SyntheticSmoothMoveGesture(move_params));
        return true;
    }
    return false;
}

} // namespace content
